I don't think I've ever fallen into the advertising gimmick thankfully.Its doable with a boosted LS. A good friend of mine built a boosted 370 LS with a procharger and when it was all said and done he was in the 600's power wise and getting 22mpg. It was a very detailed build. But that's what it takes for outstanding results. Just buying any ol' advertised parts and slapping it together will always lead to disappointment.
I know a few setups that work and can last for 300k miles. I already have 240k+ miles with this 75mm turbo on a LQ4.
We put a 4.8 in my buddy's mustang with twin 71's and he put down 1030 or 1130hp to the tire. Dont remember which number but either is alot. Running M1 Methanol and a Turbo Glide, MPG is not what he is looking for.
I Luvs turbos.....
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